/**
 * Storage-specific errors for LearnGraph
 *
 * @packageDocumentation
 */
/**
 * Base error class for storage operations
 */
export declare class StorageError extends Error {
    readonly code: string;
    readonly cause?: Error | undefined;
    constructor(message: string, code: string, cause?: Error | undefined);
}
/**
 * Thrown when connection to storage backend fails
 */
export declare class ConnectionError extends StorageError {
    constructor(message: string, cause?: Error);
}
/**
 * Thrown when attempting operation without active connection
 */
export declare class NotConnectedError extends StorageError {
    constructor();
}
/**
 * Thrown when a skill or edge is not found
 */
export declare class NotFoundError extends StorageError {
    readonly entityType: 'skill' | 'edge';
    readonly entityId: string;
    constructor(entityType: 'skill' | 'edge', entityId: string);
}
/**
 * Thrown when attempting to create a duplicate entity
 */
export declare class DuplicateError extends StorageError {
    readonly entityType: 'skill' | 'edge';
    readonly entityId: string;
    constructor(entityType: 'skill' | 'edge', entityId: string);
}
/**
 * Thrown when edge references non-existent skill
 */
export declare class ReferenceError extends StorageError {
    readonly edgeId: string;
    readonly missingSkillId: string;
    readonly role: 'source' | 'target';
    constructor(edgeId: string, missingSkillId: string, role: 'source' | 'target');
}
/**
 * Thrown when data validation fails
 */
export declare class ValidationError extends StorageError {
    readonly field?: string | undefined;
    readonly value?: unknown | undefined;
    constructor(message: string, field?: string | undefined, value?: unknown | undefined);
}
/**
 * Thrown when a query times out
 */
export declare class TimeoutError extends StorageError {
    readonly operation: string;
    readonly timeoutMs: number;
    constructor(operation: string, timeoutMs: number);
}
/**
 * Thrown when a cycle is detected in the graph
 */
export declare class CycleDetectedError extends StorageError {
    readonly path: string[];
    constructor(path: string[]);
}
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